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Succession of Microorganisms - The concept of microorganism succession does not mean that bacteria ALWAYS came first, then non-decay-causing fungi, then decay-causing fungi. Definitely NOT SO! Succession means the orderly sequence of microorganisms. The order is such that the survival of individuals and groups is maintained in relationship to or in association with the specific environmental and other conditions. In some cases, it is possible that decay-causing fungi will be the first microorganisms to interact with the tree. Natural systems do not come in absolutes.